Just want to share this New York Times article with you, especially if you need some motivation to hit the gym.

Muscular power, especially in the legs — which are the largest muscles in the body — is widely accepted as a marker of healthy aging. Older people with relatively powerful leg muscles get around better than those with weak legs. They also tend to have sharper minds, studies show.

of the 324 twins, those who had had the sturdiest legs a decade ago showed the least fall-off in thinking skills... on average, a muscularly powerful twin now performed about 18 percent better on memory and other cognitive tests than her weaker sister.